Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6466681 | Weather resistant sound attenuating modular communications headset | William D. Siska, Jr. | 2002-10-15 |
| 5697099 | Helmet with an alarm | William D. Siska, Jr., Vernon C. Lenz | 1997-12-16 |
| 5159641 | Microphone circuit control mechanism for breathing apparatus | William D. Siska, Jr., Vernon C. Lenz | 1992-10-27 |